/*
 * Copyright 2011 Clean GWT
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.cleangwt.web.client;

import com.cleangwt.json.client.ObjectDeserializer;
import com.cleangwt.user.client.PendingHandler;

/**
 * A {@link PendingCallback} to deserialize json response to the type object.
 * 
 * @author Jess
 * @version 1.0
 * @since 1.0
 */
public abstract class ObjectCallback<T> extends PendingCallback {

  /**
   * Creates a object callback.
   * 
   */
  public ObjectCallback() {
    this(null);
  }

  /**
   * Creates a object callback with the given pending handler.
   * 
   * @param pendingHandler the pending handler
   */
  public ObjectCallback(PendingHandler pendingHandler) {
    super(pendingHandler);
  }

  /**
   * Called when json response is deserialized to the type object.
   * 
   * @param object the type object
   */
  protected abstract void onCallback(T object);

  @SuppressWarnings("unchecked")
  @Override
  protected final void onSuccess(String result) {
    onCallback((T) ObjectDeserializer.get().deserialize(result));
  }

}
